Skin color varies in human populations because a balance must be struck between the need to protect the skin from ultraviolet radiation against the need to absorb ultraviolet radiation in order to

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     produce vitamin D
      protect the body from folic acid deterioration
      maintain body temperature
      all of the above
asked Jun 29, 2012 in Anthropology by anonymous
    

1 Answer

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produce vitamin D
answered Jun 30, 2012 by Bioshare ~Top Expert~ (34,070 points)

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